diff --git a/compact/ecal.xml b/compact/ecal.xml
index 0e75d38c70d615d5e493381d04451dddb33a96bd..f373bb7fb7e5830db0fa73e077c80f25cf4c8fb7 100644
--- a/compact/ecal.xml
+++ b/compact/ecal.xml
@@ -5,7 +5,7 @@
     <constant name="CrystalEndcap_rmax"  value="EcalEndcapN_rmin"/>
     <constant name="CrystalBox_x_length" value="20.0*mm"/>
     <constant name="CrystalBox_y_length" value="20.0*mm"/>
-    <constant name="CrystalBox_z_length" value="200.0*mm"/>
+    <constant name="CrystalBox_z_length" value="180.0*mm"/>
     <constant name="CrystalBox_offset"   value="0.000001*mm"/>
     <constant name="CrystalEndcap_x_pos" value="0.0*m"/>
     <constant name="CrystalEndcap_y_pos" value="0.0*m"/>